Which correctly lists three different geologic features that help scientists determine the relative ages of rocks by their positions?

Index fossils help correlate the relative ages of rock layers, while intrusions and cross-cutting relationships show that the rocks or features being cut must be older than the intrusion or feature crossing them. Together, these are useful clues for determining relative ages. Erosion and magma alone are not specific dating relationships, so the correct choice is “index fossils, intrusions, and cross-cutting relationships.”

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